Improvement in grinding-machines



A. E. ELMER. Grinding-Machine.

NO. 202,640. Patented April 23,1878.

NFETERS. PHOTO-LITHOGRAPHER, WASHINGTON D C UNITED STATES PATENT QFFIOE.

ALBERT E. ELMER, OF SHELBURNE FALLS, MASSACHUSETTS.

IMPROVEMENT IN GRINDING-MACHINES.

Specification forming part of Letters Patent N 0. 202,640, dated April23, 1878; application filed August 21, 1877.

To all whom it may concern:

Be it known that I, ALBERT E. ELMER, of Shelburne Falls, of the countyof Franklin and State of Massachusetts, have invented a new and usefulImprovement in Machinery for Grinding the Blades of Cutlery; and dohereby declare the same to be described in the following specificationand represented in the accompanying drawings, of which- Figure 1 is atop view, Fig. 2 a side elevation, and Fig. 3 a longitudinal section, ofa machine embracing my invention. Fig. 4 is an inner side view of theprismatic rotary blade-carrier.

By the said machine the backs as well as the sides of the blades may beground, such blades being held and presented to the grinding-wheel by arotary prism or carrier capable of being revolved so as to present thesides as well as the backs of the blades to the wheel.

In the drawings, A denotes the main frame, supporting the shaft of agrinding-wheel, B. On the platform 0 of the said frame is a carriage, D,arranged between parallel guides at a, and being capable of being movedtransversely between and against either of two adjustable stops, 1) b,which are screws, screwed through standards 0 0, extending up from theframe A, as shown.

A lever, d, pivoted to the frame A, and extending up through a link, 0,hinged to the said carriage D, enables a person to move the latter fromone stop to the other, as occas1on may require.

On the carriage D is another carriage, E, movable between parallelguides f f, either toward or from the grinding-wheel, such carriage Ehaving a spring, G, for automatically retracting it. A lever, H, pivotedto the carriage D, and connected with the carriage E by a link, 9,serves to advance the said carriage. I

Furthermore, in a frame, h, projecting up from the carriage E there isfixed a rotary prismatic shaft, K, it being applied to the frame so asto be capable of being revolved on its axis. It is provided with ahandle, L, arranged as shown, for turning it about ninety degrees. Thisshaft K or rotary blade-carrier is furnished with spring-clamps l l, forholding the blades m m. It also has studs n n for the edges of theblades to rest on.

Furthermore, in rear of the prismatic shaft is a standard, 0, providedwith a screw, 10. which is screwed through the standard, and serves as astop to determine the inclination of the blade side of the prism to thehorizon, in order for the grinding-wheel to grind the side of a blade toits proper angle to the back of such blade.

It will readily be seen that with this machine, either before or after ablade may have been ground on its side, such blade may be partiallyrevolved, so as to bring its back toward and against the wheel, and suchblade may be moved lengthwise, so as to cause its back to be partially,if not entirely, ground or reduced.

My machine, though very like that described in the United States PatentNo. 188,230, differs therefrom in having its knife-carrier capable ofbeing revolved, so as to admit of the side and the back of a blade beingground, whereas, by the patented machine, the side only can be reduced.

Furthermore, my machine is provided with mechanism for automaticallyretracting the knife-carrier carriage, such enabling a workman tooperate the machine to better advantage in some respects.

There are also to the machine inclined adjustable abutments a or,arranged as shown, and fixed by screws 11 b to the frame h of thecarriage E. On revolving backward the shaft K the shanks of the clamps lI will be brought against such abutments, and will be moved so as torelease the blades from the pressure of the clamps.

I do not claim a machine as described and claimed in the said Patent N0. 188,230 but What I claim as of my invention is as follows-that is tosay:

1. In the machine as explained for grinding cutlery-blades, the rotaryblade-carrier K, constructed and applied so as to be capable, on beingrevolved, of presenting to the stone, in succession, either a side orthe back of a blade, when such blade is clamped to it, as set ments awith the carriage E and the rotary forth. shaft K, and the blade-clampsthereof, all be- 2. The combination of the retractive spring ingsubstantially as described. G with the two carriages D E, the rotarycar- ALBERT E. ELMER.

riages, as set forth.

rier K, and the lever H, applied to such cari Witnesses:

3. The combination of the inclined abut-l

